University of Illinois Extension

Quiz

Section 905.120 — Disinfection

  1. Section 905.120 — Disinfection
    Incorrect. The correct answer is highlighed in green below.

    Effluent discharges must be disinfected with a chlorine solution if
    1. The effluent is discharged to an underground drain field.
    2. The effluent is discharged to a ground surface and leaves the property.
      (905.120 a 1) General. Surface discharges shall be disinfected with a chlorine solution under the following conditions: 1) When the effluent is discharged to the ground surface and the effluent leaves the property. 2) When an individual effluent or the effluent from a common collector is discharged to a pond, lake, or stream in which swimming, water skiing, or other water contact recreation occurs.
    3. The effluent is discharged to a sand filter.
    4. The effluent is discharged to a lagoon.
  2. Section 905.120 — Disinfection
    Incorrect. The correct answer is highlighed in green below.

    Chlorine contact tanks shall be baffled and provide a contact time of 30 minutes based on _______ times the average flow.
    1. 2 1/2
      (905.120 b) Chlorine Feeders. Chlorination equipment shall have a means of removal of solids. Appendix A: Illustration S of this Part provides an example of a typical chlorine feeder. All chlorine feeders shall meet the requirements of Appendix A: Illustration S of this Part. Other feeders which meet the requirement of this Section are also acceptable.
    2. 1 1/2
    3. 3
    4. 5
  3. Section 905.120 — Disinfection
    Incorrect. The correct answer is highlighed in green below.

    Final effluent free chlorine residual of ___ to ______ shall be maintained
    1. 2 to 15 mg/l
    2. 20 to 150 mg/l
    3. 0.2 to 1.5 mg/l
      (905.120 e) Chlorine Residual. A final effluent free chlorine residual of 0.2 to 1.5 mg/1 shall be maintained.
    4. 0.002 to 0.15 mg/l